Carton blank



FIG. 1 is a top plan view of the carton blank, showing my design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines shown in FIG. 1 represent fold lines. 

The ornamental design for a carton blank, as shown and described. 